Spray gun



Oct. 27, 1936. F. E. CLES. E'T AL r2,059,089

M. @a FraE Clesi,

y Emilffardof Oct. 27, 1936.

F. E. CLESI ET AL `SPRAY GUN Filed sept. '7, 1934 2' sheets-sham 2 67 666&5

` .Clesi, 'EmiU/.Katog' a@ @QM Patented Oct. 27, 1936 PATENT OFFICESPRAY GUN Frank E. Clesi and Emil H. Kardorff, New Orleans, La.

Application September 7, 1934, Serial No. '143,161

11 Claims. -(Cl. 91-12.2)

This invention relates to spray guns of the type used for melting metaland spraying the l molten metal on surfaces to coat the same.

In devices of this character, it is common to employ. a wire formed ofthe metal or alloy to be melted and sprayed, this wire being fed bysuitable means into a nozzle system wherein the forward end `of the wireis .subject to fusing heat and from which thv molten material is blownunder pressure. Ordinarily a fuel gas and air are introduced underpressure and burnt in the nozzle system to eifect fusion of the wire andspraying of the molten metal, air being also used to drive an air motoror turbine operatively connected with the wire feeding device to actuate`the latter.I

In the nozzle systems of such devices leaks are apt to occur and if thewire is not fused in the proper zone, the nozzle is apt to clog. One

20 important object of the present invention is to provide an improvednozzle system so designed as to eliminate leaks.

A second important object of the present invention isto provide animproved nozzle system which, in the event of accidental clogging, maybe readily removed as a unit, the parts of the unit being easilyseparable after such removal to clear the system. i

In devices of this character the turbine, in present construction, isaccessible with diiculty and its bearings are not readily renewable whensuch renewal becomes necessary or advisable.

A third important object of the present invention is to so improve theturbine arrangement of such devices that the rotary element of theturbine, its shr it and the reducing worm carried thereon may be removedand replaced as a unit.

A fourth important object of the invention is to provide an improvedmanner of housing the lanti-friction bearings used to support the endsof the turbine shaft in such a spray-gun.

A fifth important object of the invention vis to provide an improvedwirev feeding device in such a sprayfgun whereby to accommodate va- 45rious diameters of wire under substantially uniform pressure.

With the above land other objects in view, the invention consists in`general, of certain novel 5 details of construction and combinations ofparts hereinafter :fully described, illustrated in the accompanyingdrawings and specifically claimed.

In the. accompanying drawings like characters of references indicatelike parts in the several views; and:-'

Figure 1 is a vertical median view on the longitudinal axis of thedevice.

Figure 2 is a section; the line 2-2 of Figure 1.

Figure 3 is a rear end View of the device.

Figure 4 is a face view of a certain gas and air control plate or diskforming part of the nozzle system.

Figure 5 is a diametric section through the plate shown in Figure 4.

Figure 6 is a face view of a second air and gas control plate or diskcooperating with the rst plate. y

Figure 7 is a diametric view through Figure 6.

Figure 8 is a face view of a gas and air distributing member used inconnection with the plates of Figures 4 and 6.

Figure 9 is an exploded view of the outer members of the nozzle system.

Figure 10 is an exploded view of the two inner members of the nozzlesystem. I

Figure l1 is an end View of one of the inner members of the nozzlesystem.

The bodyv of thisinvention consists of amain part or casing having abottom wall I0, a. front wall III, a rear wall I2 and side walls I3 ,thecasing being open at the top. At each side of the top of the front wallis a lug I4 to which is pivoted or hinged the forward end of a coverplate or closure I5. Pivoted to the rear wall I2 is a. latch lever I6,this lever being pivoted intermediate its ends and having its upper endprovided with a hook I1 to hold the rear end of the closure partly inelevation on I5 in closed position. At the lower part ofthe rear wallthere is provided. a recess holding a. compression spring. I8 engagingthe lower end of the lever I6 to force the said lower end rearwardly andthus to hold the hook II in engagement with the rear of the closure I5and lock the latter down. By forcing the lower end of the lever I6forwardly against the action of the spring I8, the hook I'I is releasedand the hinged closure is allowed to open. f

In the front wall II there is provided an opening I9 wherethroughextends the shank or stem 20 of a main nozzle member having acylindrical body 2|. Between the body 2I and the front wall` II there isprovided a pair of disks 22 and 23 which serve, among other purposes, tospace the body 2i from the front wall II. A nut 25 is screwed on therear end of the stem 20 and holds `with an axial passage or bore` 26 forthe wire used herein. Extending forwardly fromr the body 2| is anexteriorly frusto-conical wall or body tip 21 internally threaded at itsforward part and having a circumferential channel 28 formed in its innerface adjacent the body 2| and constituting a gas chamber.

In the bottom of the front wall I I at its junction with the bottom wallI there is provided a bore extending transversely of the casing andhaving a liner 29 wherein is fitted a valve 3|) controlled by a handle3|. Screwed into the lower side of this valve chamber is a nipple 32which, with the valve in operating position, supplies air to a pair ofports 33 communicating through ports 34 in the member 22 and registeringports 35 in the member 2| with an outer channel 36 in the body 2|. Bymeans of a series of ports 31 this channel opens through the forwardface of thebody around the exterior of the wall 21. Also, the valve 38affords controlled communication between a nipple 38 and registeringports 39 and 40 in the disks 22 and 2| respectively, regis'- teringgrooves 4| being provided in the confrontlng faces of these disks. Theports 40 open into a channel 42 in the rear face of the body 2| and thischannel communicates by ports 43 with the channel 28.

The interior of the port 28 is screw-threaded and into this port isscrewed the rear inner nozzle member 44, the same having an enlargedexternally threaded rear portion 45 spaced somewhat from its rear face.'Ihis rear face fits tightly against the front face of the body 2| andthe member 44 is provided with a bore 46 which, when the parts 44 and 2|are assembled, forms a continuation of the bore 26. The member 44 has abody of less external diameter than the internal diameter of the part21. Grooves 41 cut longitudinally through the portion 45 so that gas maypass through these grooves from the chamber 28 to the forward end of themember 44. Secured into the forward end of the part is a front innernozzle member 48, the internal diameter of which is larger than theexternal diameter of the forward end of the part 44 so that an annularpassage is formed between these parts. The forward end of the part 48 iscontracted forwardly to form a valve seat as at 49 and the forward endof the part 44 is similarly tapered as at 58. By this means the width ofthe annular passage between the outlet ends of these two parts may beregulated, it being merely necessary to adjust the part 48 relatively tothe part 44 in the part 21. Obviously the part 48 is of tubularformation to permit forward passage of gas between this part and thefront end of part 44.

Secured on the body 2| is the rear end of the frusto-conical shell orouter nozzle member 58 having a cylindrical forward end surrounding themember 48 in spaced concentric relation thereto. On this forward end isscrewed the tip 52 having a frusto-conical bore 53 which isconcentrically spaced from the end 49 of the part 48. This tip projectsforwardly of the part 49 so that the space in the forward end of the tip52 forms a melting chamber.

The wire used projects through the members 44 and 48 into this chamberand is lthere melted due to the combustion of gas flowing into saidchamber between the parts 58 and 49 and its combination with the oxygenof the air flowing into this chamber between the parts 49 and 52, themixture having, of course, been ignited. The airblast, due to excessair, forcibly sprays the molten metal out ofthe tip. A nut 5I' locks thetip in position on the member 50.

On one of the side walls I3, preferably the right side wall, there isprovided a boss 54 internally hollowed and shouldered at its inner endto provide a comparatively small opening 55 communicating with theinterior of the casing. 'I'he outer part of this boss constitutes arotor casing and is open at its outer side. A cap or closure 56 isfitted on the outer end of this rotor casing to provide a cylindricalchamber 51. In this chamber is mounted a rotor 58 which substantiallyconstitutes the rotary element of a prime mover such as a turbine. Thecap or closure is secured on the boss by bolts 59. The cap or closure 56is provided with a lhollow boss 60 axially alined with the rotor 58.This rotor 58 is fixed on a shaft 6| between an internal collar 62 and aclamping nut 63 so as to be held in proper position between the cap orclosure 56 and the side wall I3. Also, a bearing housing 64 is fittedinto the cap 60 and is provided with av flange 65 whereby it is boltedto the outer end of the cap 60. 'I'his bearing housing is ofsubstantially cup-shape so that it may receive the anti-friction bearing66, the inner race of which is fitted on the right hand end of the shaft6I while its outer race is force fitted into the interior of the member64 and is clamped into posi-- tion therein by the cap 61 screwed intothe member 64 and forming a closure therefor, dust, moisture and airproof.

In the middle of the shaft 6| there is provided a worm 68 which mesheswith a worm gear 69 fixed on a shaft 1|) extending longitudinally of thecasing between the walls II and I2. This shaft has its ends mounted inantifriction bearings 1I mounted in pockets similar to the pockets 64vas shown at 12 and smilarly held by closures 13.

I'he shaft 10 carries a worm 14 fixed on this shaft and this worm mesheswith a worm gear fixed on a shaft 16 which extends transversely of thecasing and has its ends mounted in antifriction bearings 11 mounted inhousings 18 closed by caps 19. On the shaft 16 is mounted a roller 80the upper periphery of which is axially alined with the bore 26.

Within the` casing there is provided a pair of lugs 8| wherein ismounted a shaft 82 to which is pivoted one end of each of a pair oflevers 83 which carry intermediate their ends a shaft 84 whereon ismounted a feed roller 85 cooperating with the roller 80. 'I'he levers 83are connected by a transverse member 86 which is forced downwardly by a.screw 81, screwed through a sleeve 88 having a collar 89 on its lowerend. This screw passes through the hollow boss 90 on the upper side ofclosure I5 of the casing, this closure being provided with a lining 9|and a cap 92 holding the closure in place. The spring 93 engages thecollar 89 on the sleeve 88 and forces the sleeve 88 downwardly withoutrespect to the position of the screw 81. By this means, adjustment ofthe screw 81 serves to grip the wire W4 between the roller 94, fixed onthe shaft 84 and the roller 8|).

Alined with the opening I9 in the rear wall |2 is an opening 95wherethrough passes a, tubular guide 96 having a collar 91 whereby it isheld in position by the member 98. The handle 99 is provided formanipulating the device.

A nipple |00 admits air pressure to the valve chamber and the passage ofai;` therethrough is controlled by the position of tbe valve so thatwhen the parts are in operative position, air

and air in their ignited state melt the forwardv end of the Wire, whichis then sprayed out from the member 52`on to the surface to be coated.

It will be observed that the rings 22 and 23 are independently rotatableon the stem 20 so that the ports 34 and 35 may be moved into and out ofregistry and thereby control the flow of air to the nozzle. At the sametime, due to the channel arrangement-at 4|, the gas iiow is not in anyway restricted, being uniform, in accordance with the open or closedposition of the valve 30. Thereby, the proper proportion of. air

and gas is assured to produce substantially per' fect combustion withthe attendant rate of heat and melting of the wire.

There has thus been provided a highly efficient device of the kinddescribed and for the purpose specified.

It is obvious that minor changes may be made in the form andconstruction of the invention, without departing from the materialprinciples involved. It is not, therefore, desired to confine theinventionto the exact form herein shown and described, but it is desiredto include all such changes as properly come within the scope of theappended claims.

What is claimed as new is:

1. In a device of the kind described, a nozzle system including a basemember having a forwardly projecting portion and provided with outer.and inner channels opening respectively on the outer and inner sidesfofsaid forwardly projecting portion, a wire conduit screwed into the rearpart of said forwardly projecting portion, an outer shell mountedexternally of ,said forwardly projecting portion, a discharge tip on theend of said outer shell, and af gas feed flow control located betweensaid tip and conduit and screwed into the forward part of the forwardlyprojecting portion of the base member.

2. In a metal spraying device, a casing having a front wall providedwith air and gas passages opening through the outer face of said front,a nozzle system including a base member having a body provided with astem removably fitted in said front wall, said base member havingrearwardly opening inner and outer channels and perforations extendingfrom said'channels through its forward face, means to secure the nozzlesystem to said front wall, rotary valve means on said stem between thebody of the base member and said front wall and controlling the iiow orair to one of said channels, said valve means including a pair ofindependently rotatable rings.

3. In a metal spraying device, a casing having a front wall providedwith air and gas passages opening through the outer face of said front,a nozzle system including a base member having a body provided with astem removably fitted in said front wall, said base member hav-` theiiow of air to one of said channels, said valve means including a pairof independently rotatable rings, the confronting faces of said ringsbeing each provided with an annular channel,

said channels registering with each other and 5 being provided withports in their bottoms, the ports on the front ring 'opening into theinner channel of the base. z

4. In a metal spraying device, a casing having a front wall providedwith air and gas passages 10 opening through the outer face of saidfront, a i nozzle system including a base member having a body providedwith a stem removably fitted in said front wall, said base member havingrearwardly. opening inner and outer channels and 15 perforationsextending from said channels` through its forward face, means to securethe nozzle system to said front Wall, rotary valve means on said stembetween the body of the base member and said front wall and controllingthe 20 flow of air to one of said channels, said valve means including apair of independently rotatable rings, the confronting faces of saidrings being each provided with an annular channel, said channelsregistering with each other and being 25 provided with ports in theirbottoms, the ports on the front ring opening into the inner channel ofthe base, said rings being further provided with ports movable into andout of registry by relative rotation of the rings, the last mentioned 30ports of the front ring opening into the outer channel of the base. l

5. In a metal spraying device, a casing having a front wallprovided withair and gas passages opening through the outer face of said front, a 35nozzle system including a base member having a, body provided with astem removably tted in 4 said front wall, said base memberv havingrearwardly opening inner and outer channels, and

perforations` extending from said channels 40 through its forward face,means to secure the nozzle systemiftofsaid front wall, rotary valvemeans on saidmstem between the body of the base member and said frontwall and controlling the iiow of air to one of said channels, said base45 member having an annular forward extension between the perforationsof the inner and outer channels of the base member, said extension beinginternally threaded and having an internal channel at its rear end, anda wire guide having 50 -an enlarged and threaded rear end screwed intosaid extension and having longitudinal channels extending through thethreads onsaid rear end.

6. In a metal spraying device, a casing having 56 a front wall providedwith air and gas passages opening through the outer face of said front,a nozzle system including a base member having a body provided with astem removably fitted in said front wall, said base member having rear-00 wardly opening inner and outer channels and perforations extendingfrom said channels through its forward face, means to secure the nozzlesystem to said front wall, rotary valve means on said stem between thebody of the 5 base member and said front wall and controlling theflow-of air to one of said channels, said valve A means including a pairof independently rotatableff rings.

7. In a metal spraying device, a casing having 70 a front wall providedwith air and gas passages opening through the outer face of said front,a nozzle system including a base member having a body provided withastem removably fitted in said front wall, said base member havingV rear-75 wardly opening inner and outer channels and perforations extendingfrom said channels through its forward face, means to secure the nozzlesystem to said front wall, rotary valve means on said stem between thebody of the base member and said front wall and controlling the flow ofair to one of said channels, said valve means including a pair ofindependently rotatable rings, the confronting faces of said rings beingeach provided with an annular channel, said channels registering witheach other and being provided with ports in their bottoms, the ports onthe front ring opening into the inner channel of the base, said basemember vhaving an annular forward extension between the perforations ofthe inner and outer channels of the base member, said extension beinginternally threaded and having an internal channel at its rear end, anda wire guide having an enlarged and threaded rear end screwed into saidextension and having longitudinal channels extending through the threadson said'rear end.

` 8. In a metal spraying device, a casing having a front wall providedwith air and gas passages opening through the outer face of said front,a nozzle system including a base member having a body provided with a4stem removably tted t flow of air to one of said channels. said valvemeans including a pair of independently rotatable rings, the confrontingfaces of said rings being each provided with an annular channel, saidchannels registering with each other and being provided with ports intheir bottoms, the port on the front ring opening into the inner channelof the base, said rings being further provided with ports movable intoand out of registhe perforations of the inner and outer channels of thebase member, said extension being internally threaded and having aninternal channel at its rear end, and a Wire guide having an enlargedand threaded rear end screwed into said extension and havinglongitudinal channels extending through the threads on said rear end.

9. In a device of the kind described, a casing, a rotor chamber in saidcasing, a cap on said rotor chamber closing the outer end thereof, aboss on said cap having a cup-shaped formation, a cupshaped housingmounted in said boss, an antifriction bearing mounted in said housing, acap closing the outer end of said housing and closing the same, saidlast cap serving to hold the anti-friction gear in position, a shafthaving one end supported in said anti-friction gear, a rotor in saidchamber fixed on said shaft, and means to support the other end of saidshaft.

10. In a device of the kind described, a casing, a ro-tor chamber insaid casing, a cap on said rotor chamber closing the outer end thereof,a

boss on said cap having a cup-shaped formationL a cup shaped housingmounted in said boss, an anti-friction bearing mounted in said carrier,a cap closing the outer end of said carrier and closing the same, saidlast cap serving to hold the antifriction bearing in position, a shafthaving one end supported in said anti-friction bearing,

a rotor in said chamber fixed on said shaft, said Y boss having anopening at its inner end, a worm on said shaft of less diameter thansaid opening, and means on the opposite side wall supporting theremaining end of said shaft.

11. In a metal spraying device, a casing, a boss 35

